FieldBench
Carrier codes

Carrier

EH

Protect

Electric heat

Strips not coming on, or on when they should not.

Walk EH in Diagnose

Sign in for the next measurement

First check

1 Is aux actually being requested?

On Carrier 50FC confirm W / E / aux at the indoor control. A heat-pump call with a communicating board that thinks it needs strips is a config / outdoor issue first. W1/W2 at the unit board. Sequencer 24V, then element ohms, then kit fuses.

Expect: Aux request present only when it should be.

The rest of the walkthrough is Diagnose.

On the plates

  • W1/W2 at the unit board. Sequencer 24V, then element ohms, then kit fuses.
  • A unit that only runs strips on a 50FCQ is a failed HP circuit.

Plates that use EH